Remove test_per_src

Remove test_per_src, it never worked well and is incompatible
with all of the test infrastructure.  Uses in the platform have
been removed, generally by replacing them with individual cc_test
modules.

Test: builds
Flag: TEST_ONLY
Change-Id: I257c035da35ca8358ae9423b46453878f54efeb1
diff --git a/cc/androidmk.go b/cc/androidmk.go
index 143e86f..4134653 100644
--- a/cc/androidmk.go
+++ b/cc/androidmk.go
@@ -351,9 +351,6 @@
 	ctx.subAndroidMk(entries, test.testDecorator)
 
 	entries.Class = "NATIVE_TESTS"
-	if Bool(test.Properties.Test_per_src) {
-		entries.SubName = "_" + String(test.binaryDecorator.Properties.Stem)
-	}
 	entries.ExtraEntries = append(entries.ExtraEntries, func(ctx android.AndroidMkExtraEntriesContext, entries *android.AndroidMkEntries) {
 		if test.testConfig != nil {
 			entries.SetString("LOCAL_FULL_TEST_CONFIG", test.testConfig.String())
diff --git a/cc/cc.go b/cc/cc.go
index 24f6b83..134d89c 100644
--- a/cc/cc.go
+++ b/cc/cc.go
@@ -51,7 +51,6 @@
 		ctx.BottomUp("sdk", sdkMutator).Parallel()
 		ctx.BottomUp("llndk", llndkMutator).Parallel()
 		ctx.BottomUp("link", LinkageMutator).Parallel()
-		ctx.BottomUp("test_per_src", TestPerSrcMutator).Parallel()
 		ctx.BottomUp("version", versionMutator).Parallel()
 		ctx.BottomUp("begin", BeginMutator).Parallel()
 	})
@@ -799,7 +798,6 @@
 	dataLibDepTag         = dependencyTag{name: "data lib"}
 	dataBinDepTag         = dependencyTag{name: "data bin"}
 	runtimeDepTag         = installDependencyTag{name: "runtime lib"}
-	testPerSrcDepTag      = dependencyTag{name: "test_per_src"}
 	stubImplDepTag        = dependencyTag{name: "stub_impl"}
 	JniFuzzLibTag         = dependencyTag{name: "jni_fuzz_lib_tag"}
 	FdoProfileTag         = dependencyTag{name: "fdo_profile"}
@@ -826,11 +824,6 @@
 	return depTag == runtimeDepTag
 }
 
-func IsTestPerSrcDepTag(depTag blueprint.DependencyTag) bool {
-	ccDepTag, ok := depTag.(dependencyTag)
-	return ok && ccDepTag == testPerSrcDepTag
-}
-
 // Module contains the properties and members used by all C/C++ module types, and implements
 // the blueprint.Module interface.  It delegates to compiler, linker, and installer interfaces
 // to construct the output file.  Behavior can be customized with a Customizer, or "decorator",
@@ -1786,11 +1779,6 @@
 	return nil
 }
 
-func (c *Module) IsTestPerSrcAllTestsVariation() bool {
-	test, ok := c.linker.(testPerSrc)
-	return ok && test.isAllTestsVariation()
-}
-
 func (c *Module) DataPaths() []android.DataPath {
 	if p, ok := c.installer.(interface {
 		dataPaths() []android.DataPath
@@ -1943,16 +1931,6 @@
 		TopLevelTarget: c.testModule,
 	})
 
-	// Handle the case of a test module split by `test_per_src` mutator.
-	//
-	// The `test_per_src` mutator adds an extra variation named "", depending on all the other
-	// `test_per_src` variations of the test module. Set `outputFile` to an empty path for this
-	// module and return early, as this module does not produce an output file per se.
-	if c.IsTestPerSrcAllTestsVariation() {
-		c.outputFile = android.OptionalPath{}
-		return
-	}
-
 	c.Properties.SubName = GetSubnameProperty(actx, c)
 	apexInfo, _ := android.ModuleProvider(actx, android.ApexInfoProvider)
 	if !apexInfo.IsForPlatform() {
@@ -3758,14 +3736,12 @@
 }
 
 // Overrides ApexModule.IsInstallabeToApex()
-// Only shared/runtime libraries and "test_per_src" tests are installable to APEX.
+// Only shared/runtime libraries .
 func (c *Module) IsInstallableToApex() bool {
 	if lib := c.library; lib != nil {
 		// Stub libs and prebuilt libs in a versioned SDK are not
 		// installable to APEX even though they are shared libs.
 		return lib.shared() && !lib.buildStubs()
-	} else if _, ok := c.linker.(testPerSrc); ok {
-		return true
 	}
 	return false
 }
diff --git a/cc/cc_test_only_property_test.go b/cc/cc_test_only_property_test.go
index c14f34e..972e86b 100644
--- a/cc/cc_test_only_property_test.go
+++ b/cc/cc_test_only_property_test.go
@@ -78,38 +78,6 @@
 	}
 }
 
-func TestTestOnlyValueWithTestPerSrcProp(t *testing.T) {
-	t.Parallel()
-	ctx := android.GroupFixturePreparers(
-		prepareForCcTest,
-	).RunTestWithBp(t, `
-                // These should be test-only
-                cc_test { name: "cc-test",
-                          gtest: false,
-                          test_per_src: true,
-                          srcs: ["foo_test.cpp"],
-                          test_options: { unit_test: false, },
-                         }
-	`)
-
-	// Ensure all variation of test-per-src tests are marked test-only.
-	ctx.VisitAllModules(func(m blueprint.Module) {
-		testOnly := false
-		if provider, ok := android.OtherModuleProvider(ctx.TestContext.OtherModuleProviderAdaptor(), m, android.TestOnlyProviderKey); ok {
-			if provider.TestOnly {
-				testOnly = true
-			}
-		}
-		if module, ok := m.(*Module); ok {
-			if testModule, ok := module.installer.(*testBinary); ok {
-				if !testOnly && *testModule.Properties.Test_per_src {
-					t.Errorf("%v is not test-only but should be", m)
-				}
-			}
-		}
-	})
-}
-
 func TestTestOnlyInTeamsProto(t *testing.T) {
 	t.Parallel()
 	ctx := android.GroupFixturePreparers(
diff --git a/cc/test.go b/cc/test.go
index a96af31..f5bb761 100644
--- a/cc/test.go
+++ b/cc/test.go
@@ -15,11 +15,9 @@
 package cc
 
 import (
+	"github.com/google/blueprint/proptools"
 	"path/filepath"
 	"strconv"
-	"strings"
-
-	"github.com/google/blueprint/proptools"
 
 	"android/soong/android"
 	"android/soong/tradefed"
@@ -75,13 +73,9 @@
 }
 
 type TestBinaryProperties struct {
-	// Create a separate binary for each source file.  Useful when there is
-	// global state that can not be torn down and reset between each test suite.
-	Test_per_src *bool
-
 	// Disables the creation of a test-specific directory when used with
 	// relative_install_path. Useful if several tests need to be in the same
-	// directory, but test_per_src doesn't work.
+	// directory.
 	No_named_install_directory *bool
 
 	// list of files or filegroup modules that provide data that should be installed alongside
@@ -174,86 +168,14 @@
 	return module.Init()
 }
 
-type testPerSrc interface {
-	testPerSrc() bool
-	srcs() []string
-	isAllTestsVariation() bool
-	setSrc(string, string)
-	unsetSrc()
-}
-
-func (test *testBinary) testPerSrc() bool {
-	return Bool(test.Properties.Test_per_src)
-}
-
-func (test *testBinary) srcs() []string {
-	return test.baseCompiler.Properties.Srcs
-}
-
 func (test *testBinary) dataPaths() []android.DataPath {
 	return test.data
 }
 
-func (test *testBinary) isAllTestsVariation() bool {
-	stem := test.binaryDecorator.Properties.Stem
-	return stem != nil && *stem == ""
-}
-
-func (test *testBinary) setSrc(name, src string) {
-	test.baseCompiler.Properties.Srcs = []string{src}
-	test.binaryDecorator.Properties.Stem = StringPtr(name)
-}
-
-func (test *testBinary) unsetSrc() {
-	test.baseCompiler.Properties.Srcs = nil
-	test.binaryDecorator.Properties.Stem = StringPtr("")
-}
-
 func (test *testBinary) testBinary() bool {
 	return true
 }
 
-var _ testPerSrc = (*testBinary)(nil)
-
-func TestPerSrcMutator(mctx android.BottomUpMutatorContext) {
-	if m, ok := mctx.Module().(*Module); ok {
-		if test, ok := m.linker.(testPerSrc); ok {
-			numTests := len(test.srcs())
-			if test.testPerSrc() && numTests > 0 {
-				if duplicate, found := android.CheckDuplicate(test.srcs()); found {
-					mctx.PropertyErrorf("srcs", "found a duplicate entry %q", duplicate)
-					return
-				}
-				testNames := make([]string, numTests)
-				for i, src := range test.srcs() {
-					testNames[i] = strings.TrimSuffix(filepath.Base(src), filepath.Ext(src))
-				}
-				// In addition to creating one variation per test source file,
-				// create an additional "all tests" variation named "", and have it
-				// depends on all other test_per_src variations. This is useful to
-				// create subsequent dependencies of a given module on all
-				// test_per_src variations created above: by depending on
-				// variation "", that module will transitively depend on all the
-				// other test_per_src variations without the need to know their
-				// name or even their number.
-				testNames = append(testNames, "")
-				tests := mctx.CreateLocalVariations(testNames...)
-				allTests := tests[numTests]
-				allTests.(*Module).linker.(testPerSrc).unsetSrc()
-				// Prevent the "all tests" variation from being installable nor
-				// exporting to Make, as it won't create any output file.
-				allTests.(*Module).Properties.PreventInstall = true
-				allTests.(*Module).Properties.HideFromMake = true
-				for i, src := range test.srcs() {
-					tests[i].(*Module).linker.(testPerSrc).setSrc(testNames[i], src)
-					mctx.AddInterVariantDependency(testPerSrcDepTag, allTests, tests[i])
-				}
-				mctx.AliasVariation("")
-			}
-		}
-	}
-}
-
 type testDecorator struct {
 	LinkerProperties    TestLinkerProperties
 	InstallerProperties TestInstallerProperties
@@ -382,10 +304,6 @@
 	}
 	moduleInfoJSON.TestConfig = append(moduleInfoJSON.TestConfig, test.extraTestConfigs.Strings()...)
 
-	if Bool(test.Properties.Test_per_src) {
-		moduleInfoJSON.SubName = "_" + String(test.binaryDecorator.Properties.Stem)
-	}
-
 	moduleInfoJSON.DataDependencies = append(moduleInfoJSON.DataDependencies, test.Properties.Data_bins...)
 
 	if len(test.InstallerProperties.Test_suites) > 0 {